linux-kernel - Re: [PATCH 5/6] atmel-mci: Power control option for each MMC Slot

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Date:	Wed, 17 Jun 2009 10:08:57 +0200
From:	Marc Pignat <marc.pignat@...s.ch>
To:	linux-arm-kernel@...ts.arm.linux.org.uk
Cc:	Rob Emanuele <rob@...nuele.us>, nicolas.ferre@...el.com,
	haavard.skinnemoen@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] atmel-mci: Power control option for each MMC Slot

Hi!

On Wednesday 17 June 2009 02:54:38 Rob Emanuele wrote:
> Add support to the atmel-mci driver for a VCC pin in order to conserve power by removing power from an MMC Slot.
...

> @@ -1544,6 +1544,13 @@ static int __init atmci_init_slot(struct atmel_mci *host,
>  		}
>  	}
>  
> +	if (gpio_is_valid(slot->vcc_pin)) {
> +		if (gpio_request(slot->vcc_pin, "mmc_pow")) {

gpio_request will check for "gpio_is_valid" so this is not necessary.

> +			dev_dbg(&mmc->class_dev, "no power pin available\n");
> +			slot->vcc_pin = -EBUSY;
> +		}
> +	}
> +
...

Best regards

Marc
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